Information Technology Reference
In-Depth Information
As you can see, the LANE Client is up and operational:
Gambrinus#
sh lane client
LE Client ATM2/0/0 ELAN name: default Admin: up State: operational
Client ID: 2 LEC up for 12 minutes 26 seconds
ELAN ID: 1
Join Attempt: 10
Last Fail Reason: Control Direct VC being released
HW Address: 0060.4750.8402 Type: ethernet Max Frame Size: 1516
ATM Address: 47.009181000000006047508401.006047508402.00
VCD rxFrames txFrames Type ATM Address
0 0 0 configure 47.009181000000006047508401.006047508405.00
94 15 109 direct 47.009181000000006047508401.000000000002.01
95 1015 0 distribute 47.009181000000006047508401.000000000002.01
96 0 202 send 47.009181000000006047508401.000000000003.01
97 105 0 forward 47.009181000000006047508401.000000000003.01
Say that we want to contact the station 10.200.10.62:
Gambrinus#
ping 10.200.10.62
From the user point of view, it works, and nothing special can be seen:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.200.10.62, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms
If we enabled
debug lane client packet
, we would have seen the details of the process. That is, the LEC
sends an LE_ARP request to the LES and waits for the response with the ATM address to be used.
<snip>
*Mar 22 02:32:46.499: LEC ATM2/0/0: sending LANE_ARP_REQ on VCD 94
*Mar 22 02:32:46.499: LEC ATM2/0/0: LECID 2
*Mar 22 02:32:46.499: LEC ATM2/0/0: SRC MAC address 0060.4750.8402
*Mar 22 02:32:46.499: LEC ATM2/0/0: SRC ATM address 47.0091810000000060470
*Mar 22 02:32:46.499: LEC ATM2/0/0: TARGET MAC address 00e0.b012.17ff
*Mar 22 02:32:46.499: LEC ATM2/0/0: TARGET ATM address 00.0000000000000000000
*Mar 22 02:32:46.499: LEC ATM2/0/0: Flags 0x0
*Mar 22 02:32:46.499: LEC ATM2/0/0: num of TLVs 0
<snip>
*Mar 22 02:32:46.515: LEC ATM2/0/0: received LANE_ARP_RSP on VCD 95
*Mar 22 02:32:46.515: LEC ATM2/0/0: LECID 2
*Mar 22 02:32:46.515: LEC ATM2/0/0: SRC MAC address 00e0.b012.17ff
*Mar 22 02:32:46.515: LEC ATM2/0/0: SRC ATM address 47.0091810000000060471
*Mar 22 02:32:46.515: LEC ATM2/0/0: TARGET MAC address 0060.4750.8402
*Mar 22 02:32:46.515: LEC ATM2/0/0: TARGET ATM address 47.0091810000000060470
*Mar 22 02:32:46.515: LEC ATM2/0/0: Flags 0x0
*Mar 22 02:32:46.515: LEC ATM2/0/0: num of TLVs 0
<snip>
When the LEC receives the reply, it sets up a virtual channel connection (VCC) directly to this ATM
address. This VCC is called data direct VCC. Any frame that needs to be sent to this destination MAC
address will be forwarded on this VCC.
To ensure that no frame is left on the delivery path through the BUS when the data direct VCC becomes
active, a mechanism called FLUSH is used. Still with
debug lane client packet
, we can see more details
of the FLUSH process.
*Mar 22 02:32:46.627: LEC ATM2/0/0: sending LANE_FLUSH_REQ on VCD 96
<snip>
*Mar 22 02:32:46.633: LEC ATM2/0/0: received LANE_FLUSH_RSP on VCD 95
